Step 2: On Magento 2.2.4 (on which we develop the extension), there is a class: app/code/Bss/MultiStoreViewPricingCatalogRule/Model/Indexer/IndexBuilder.php:39:use Magento\CatalogRule\Model\Indexer\IndexerTableSwapperInterface, but Magento

2.2.3 and lower do not have, so we should move Indexer folder of v2.1.1 (attached) to this folder of the site: /home/[sitename]/public_html/app/code/Bss/MultiStoreViewPricingCatalogRule/Model/Indexer